Deprecate the suppressLoadErrors option

This was intended as a 3.0 migration aid for browser users who had
dependencies that triggered errors at load time. However, it was never
documented and never supported by jasmine-brower-runner, karma, or any
other commonly used tool for runing Jasmine in the browser. There is
no evidence of it actually being used. It is, however, starting to
show up in machine-generated "tutorials".

src/core/Env.js

@@ -518,6 +518,14 @@ getJasmineRequireObj().Env = function(j$) {
      * @return {Promise<JasmineDoneInfo>}
      */
     this.execute = async function(runablesToRun) {
+      if (options.suppressLoadErrors) {
+        this.deprecated(
+          'The suppressLoadErrors option is deprecated and will be removed ' +
+            'in a future release.',
+          { ignoreRunnable: true, omitStackTrace: true }
+        );
+      }
+
       installGlobalErrors();
 
       if (parallelLoadingState) {